[PodcastLists] implement replacing list's entries
[Migration] remove usage of @repeat_on_conflict
[Docs] remove outdated files-overview.rst
[Administration] remove CouchDB parts from hostinfo page
[Feeds] remove unused import
[Migration] remove unused CouchDB related scripts
[History] store episode history in Django ORM
[Tests] use new Django 1.6 test runner

https://docs.djangoproject.com/en/dev/releases/1.6/#new-test-runner
[History] add EpisodeHistoryEntry.create_entry()
[Migration] remove remaining CouchDB related code